Do I Need Floor Joist Hangers Subfloor

Layering makes it easier to change the visible floor if you tire of the look or if it has become damaged.

Do i need floor joist hangers subfloor.

The only caveat to this is that you need to make sure you have enough space to add another joist. The place where you ll be most tempted to create oversize holes and notches under the bathtub is the part of a floor you can least afford to weaken. A cast iron tub with water and occupant can weigh in at more than 800 lbs. If you re working on a floor in an older home you might want to consider adding a new layer of plywood over the decking.

Floor joists installed on second or third or higher levels double as ceiling joists for the level below. Sometimes the plans for a home may call for additional joists to be sistered next to the other floor joists for more strength. Usually when a joist gets sistered the new lumber does not span the entire length of the old joist. In cases where greater open spans are needed framers often use joist hangers which are u shaped hardware pieces that are nailed in to accept hold and support flooring joists.

This method of laying a sturdy subfloor on top of joists and then topping the subfloor with a cosmetic only flooring top creates a tighter stronger structure. Floor opening if there is an opening in your floor enter the sq footage in the floor opening field. True floor joist span calculations can only be made by a structural engineer or contractor. I am framing a dropped ceiling below an existing floor assembly which is 3 off level over 20.

Dropped ceiling will only support new 5 8 blue board. In buildings with basements the first level of floor joists serves the same purpose. It is flexible it can be changed out it is inexpensive. Are joist hangers needed at each.

This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction. This size is no longer acceptable when framing a structure. Take some extra time and jack the damaged area up so that the new lumber doesn t need to be notched. In the past 2x4s or 2x6s were sometimes used as floor joists.

They are sometimes not required at the header if they rest on a nearby drop beam and you drive nails through the face of the header into the joists. The dropped ceiling members are 2x6 s with a span of 9 attached to ledgers using 3 screws. However doing this does not fix the slant that the floor has taken since the old joists got damaged. Codes typically call for attaching joists with joist hangers at the ledger.

But even in that situation some inspectors will want to see joist hangers.